Lighting Driver Circuit for High-Speed LED Driving
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Solution Overview
Problem
Conventional lighting drivers experience energy loss and delayed driving of light-emitting components due to the need for a preparation time to establish a negative feedback mechanism, leading to inefficient pulse frequency modulation and nonlinear current changes, which affect the lighting effect.
Innovation Solution
A lighting driver incorporating a first current mirror, operational amplifier, fast switching circuit, and control circuit that maintains a constant voltage during the operational amplifier's transition from an open to a closed loop, reducing energy losses and allowing for adjustable current supply based on operational parameters using a variable current source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lighting driver uses a preparation time to establish a negative feedback mechanism, then the operational amplifier can function properly, but the driving of the light-emitting component is delayed and energy is lost
Solution Approach 1:
The patent applies preliminary action by pre-establishing the negative feedback mechanism before the light-emitting component is driven. The operational amplifier is configured with feedback paths that are ready to operate immediately, eliminating the need for preparation time and preventing energy loss during startup. This ensures that the feedback mechanism is in place before any current flow occurs, thereby avoiding the energy waste described in the technical problem.
2Duration of action of moving object
If the pulse frequency modulation signal works longer, then the working period is extended, but the energy loss cannot be fully compensated within the remaining time
Solution Approach 1:
The patent employs feedback principles by implementing a negative feedback mechanism that continuously monitors and adjusts the current through the light-emitting component. The operational amplifier with feedback paths ensures that any energy loss is immediately detected and compensated, allowing the system to maintain efficient operation throughout the extended working period without accumulating uncompensated energy losses.
3Reliability
If additional current detecting circuit and compensator circuit are disposed, then the current can be detected and compensated, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating the current detection and compensation functions into the existing operational amplifier circuit. Instead of adding separate current detecting circuit and compensator circuit, the invention combines these functions within the operational amplifier's feedback mechanism, thereby achieving reliable current compensation without significantly increasing device complexity.
4Speed
If the lighting driver drives the light-emitting component at high speed, then the response time is reduced, but the internal DC operating points must be re-established causing energy loss
Solution Approach 1:
The patent applies preliminary action by pre-configuring the operational amplifier and feedback mechanism so that they are ready to operate immediately at high speed without requiring re-establishment of DC operating points. The feedback paths are established beforehand, allowing the system to respond quickly to changes in the light-emitting component's operation without the energy loss associated with re-establishing DC conditions.
Data Source
AI summary
A lighting driver for driving a light-emitting component at a high speed is provided. A control terminal of a second transistor is connected to a control terminal and a first terminal of a first transistor. Input terminals of an operational amplifier are connected to the first terminal of the first transistor and first terminals of first and second switches. Control terminals of third and fourth transistors are connected to an output terminal of the operational amplifier. Second terminals of the first switch and the fourth transistor are connected to a first terminal of the second transistor. A second terminal of the second switch and a current source are connected to a second terminal of the third transistor. A first terminal of the fourth transistor is connected to the light-emitting component. A control circuit is connected to the current source, and control terminals of the first and second switches.